Safety-lock.



F. VOGELSANG.

SAFETY LOCK.

APPLICATION FILED MAR. 1s. |915.

Patented Dec. 3, `1918.

W'wesses:

i l y l i@ 11;

` SAFETY-Loox.

mecano.

i `Application filed March 16, 1915. SerialNo. 14,755,

To all 'whom t may concern:

Be it known that I, `Fizrrz VoenLsANm merchant, of Charlottenburg, `nearBerlin,

Germany, subject of the- German Emperor,`

residing at Charlottenburg, near Berlin, Germany, have invented certainnew and useful Improvements in Safety-Locks, of which the following is aspecification.

The present invention relates toa safety lock having three or moreradially arranged pin tumblers which by the introduction of the key aredisplaced insuch a manner that the key cylinder can be rotated forthepur-` pose of opening the lock. 1

According to the invention the pin tumblers formI various angles betweenthem; whereby` the advantage is afordedthat the introduction of the keyin the right place is facilitated and the introduction of the key in thewrong place is revented.

Accordin to afurt er construction of the invention t e pin tumblers arearranged symmetrically with respect to a plane passing through the axisof the lock, the tum blers forming equal angles with the said planehaving, also equal dimensions. This construction has the advantage thatthe lock can be closed from either side with the same key.`

Further features and advantages of the invention will be disclosed bythe following specification and claim.

The drawing illustrates two constructional forms of the invention.

Figures 1 to 3 show the lock in section,

front elevation and section on line A-B of Fig. 1.

Figs. 4 and 5 show the key in section and elevation. y

Fig. 6 shows another constructional form of the lock.

The safety lock which is particularly applicable for use on a` doorlock, consists broadly of a ring 1 which by means of the screws 2 issecured to the door or the lock already provided thereon. This ring 1 isalso provided with the key cylinder or plug 3 rotatably set thereinandwith the pin tumblers 8, 9. The cylinder` 3 is in engagement with themechanism of the doorlock, for instance, by being provided on one sidewith an arm 4 the cross-head 5 of which is connected, on inserting thesafety lock, with the bolt 6 of the door lock in such a manner that on`rotating the key cylinder 3 and therewith i SpecicationofLettersIatent. i "Pattintedl D913, 3, 1918,

1 the cross-head 5, `the boltis either` shot in or shot out. `Aszthedoorlock in which the safety lock is inserted, may be of any construction,the bolt 6 of such a lock ismerely indicated by dot and dash lines inFig. 2. rIhe ringl of the safety lock is preferably flattened on theside on which the bolt 6 bears, as indicated by the line 7.

`The ring 1 and the cylinder 3 are formed withbores `radially arrangedin sucha man- `ner that they register in the closed and opened positions(llig.` 1). Inthese bores,` the tumblers consisting of the pins 8, 9 arelocated under the influence of the springs 2% The bores are so long`that the said pins are guided throughout theirlength (Fig. 1).

The key cylinder 3 is formed with a `pluralityjof slots, which radiatefrom the center of said cylinder and extend entirely through the same,the arrangement of said slots exactlylcorresponding to that `of thetumblers. These slots are designed `to receive the radiating teeth 16 ofthe key 15,

\ so as to permit said teeth, on the introduction of the key, to comeinto contact with the pins 9 and displace the latter outwardly to suchan extent that their outer ends are flush with the periphery of thecylinder 3 and their inner ends are located in the cavities ordepressions 23 of the teeth 16. The cylinder 3 can now be rotated bymeans of the key and the door closed thereby.

In the constructional formi illustrated in Figs. l to 5, five tumblers17 18, 19, 20 and 21 have, by way of example, been provided. Each ofthese tumblers forms a different angle with the adjacent tumblers sothat the key witll the correspondingly formed teeth 16 can onlybelintroduced in the right position, that is to say in that position inwhich each of the slots 10, 11, 12, 13 and 14: of the lock cylinder isengaged by that tooth 16 of the key which can set correctly the corre-`sponding pin tumblers 8, 9. In this man- Inthe construction illustratedin Figs. 1to

5, the tumblers 17 and 18 have, for this purpose, the same dimensionsand form the same angle with the plane of the axis of the i lock, thetumblers 19, 21 are also symmetric to this plane and have equaldimensions and the tumbler 20 is located with its longitudinal axis inthe Said plane.

The dimensions of the tumblers 20 and the tumbler pairs 17-18 and 192land the angles they form between them, are, however, independent of oneanother and therefore may be varied as desired, so that notwithstandingthe symmetry, a great number of combinations is possible.

In the constructional form illustrated in Fig. 6, there are six tumblersprovided, which are arranged symmetrically in pairs with respect to theplane of the axis of the I key.

The tumblers are preferably provided in the central plane of the lock atright angles to the axis of the lock (Fig. 3) so that the introductionof the key from either side is limited by the contact between the keyshaft and the lock cylinder in such a manner that the cavities 23 formedin the teeth of the key are exactly opposite the tumblers. The teeth 16of the key need then only one cavf' ity or depression 23 per tooth sothat the lock can be opened or closed from either side by means of a keyhaving a single set of teeth. l

Having now particularly described and Copies of this patent may beobtained for ve cents each, by addressing the Commissioner of Patents.

ascertained the nature of my said invention and in what manner the Sameis to be performed, I declare that what I claim is:

A lock, Comprising, in combination, a casing; a cylinder rotatable insaid casing and having both a plurality of radiating key slots extendingcompletely therethrough, and a plurality of radiating tumbler recesseseX- actly corresponding in their arrangement to the key slots andopening into the latter at their inner ends; pin tumblers operative insaid recesses; and a key having a plurality of radiating teeth at oneend of its stem for insertion through said slots, to operatively engageall of said tumblers simultaneously; all of the recesses being disposedin solely a single plane which is located approximately midway betweenthe ends of the cylinder, and the related tumblers and slots beingdisposed symmetrically at opposite sides of a plane passing through theaxis of the cylinder, so as to permit the introduction of the key teeththrough either end of the slots. In testimony whereof I have aiixed mysignature in presence of two witnesses.

FRITZ VOGELSANG. Vitnesses:

ROBERT Miei-IELSKI, HENRY HASPER.

Washington, D. C.

